1/2 c. butter
3/4 c. sugar
2 squares semi-sweet chocolate, melted
1 tsp. vanilla
2 eggs
1 pie shell, baked

Cream butter and sugar until very fluffy. Blend in cooled chocolate. Add vanilla. Add eggs one at a time, beating 4 to 5 minutes after each egg. Pour into baked pie shell. Chill at least 2 hours. Top with Cool Whip and shaved chocolate.